Eichabd l



(No Model.)

R. L. GUIoN.

. BLECTRIGAL THBRMOSTAT. No. 354,131. Patented Dam-'14, 1886` v UNITEDSfrATEs LPATENT OFFICE.

` RICHARD L. GUION, OF ELMIRA, NEW YORK.

ELECTRICAL THERMOSTAT.

SPECIFICATION forming part of Letters Patent No. 354,131, ated December14, 1886.

Application filed March 11. 1886. Serial No. 194,782. (No model.)

To aZZ whom it may conogn:

Be it known that I, Riel-IAHD L. GUIoN, of Elmira, in the county ofChemung, in the State of New York, have invented new and usefulImprovements in Thermostats, of which the following, taken in connectionwith the accompanying drawings, is a full, clear, and exact description.

This invention consists in a novel construction of a thermostat designedto open or close an electric circuit and to be adj ustable in itsoperation.

The invention is fully illustrated in the annexed drawings, whereinFigure 1 is a side view of my improved thermostat. Fig. 2 is alongitudinal section. Fig. 3 is a top plan view with a portion of thethermostatic bar broken away to better illustrate subjacent features.Fig. 4 is an inverted plan view; and Fig. 5- is a detached sectionalview of the insulation of one of the posts,which is mounted on the baseand carries one of the electric contact-points.

The same letters of reference indicate the same or corresponding parts.

A represents a metallic base on which the thermostat is mounted. with acavity, A', on its under side, for the purpose hereinafter explained.011 one end of said base is pivoted the post B, to which is firnllyattached one end of the thermostatic bar C, which extends horizontallytherefrom.

This bar is composed of a thin fiat plate of steel, O', and a plate ofrubber, O", rigidly secured to each other side by side. The object ofthis construction is to cause said bar to deflect laterally under theinfluence of the changes of temperature, said defiection being due tothe unequal capacities of expansion and contraction of the two plates ofwhich the bar O is composed. The rubber plate, expanding more rapidlyunder the influence of heat than the steel plate, produces a defiectionof the ends of the bar toward the side on which the steel plate iscarried.

The post B is restrained from turning and confined adjustably in itsposition by means of an arm, b, which is arranged in the cavity A' inthe under side of the base A, and is rigidly attached to the protrudingend of the pivot of the post B, as shown in Fig. 2 of the drawings, saidarm being held at its free end by an indicator or pointer, I, which isadjust- Said base is formed ably clamped in its position by the screw c,about which it turns` when unclamped. A screw or other suitablecoupling-pin, d, passing through a transverse slot, f, in the base A,fastens the arni b to the indicator I back of the screw c. Thus byunclamping the indicator and turning it to one side the arm b is swunglaterally, and the thermostatic bar C is caused to change its positioncorrespondingly.

A graduated plate, e, is secured to the top of the base A, directlyunder the point of the indicator, to show the degree of the angle inwhich the bar C is set from the longitudinal central line of the base A.

At opposite sides of the free end of thebar C are two metallic posts, DD, secured to the base A, and properly insulated therefrom by rubberbushings and rubber washers, as illustrated in Fig. 5 of the drawings.To said posts are attached adjustable electric contactpoints,consisting-of screws a a, working in screw-threaded eyes transverselythrough the posts. These screws can be set to carry their adjacent endsa greater or less distance apart,

-and thus permit a greater or less` defiection of the thermostatic bar Owhen atuated by change of temperature.

At the free end of the bar O the rubber side C" thereof is eitherentirely cut away or an opening of sufficient size is made through it toallow the adj acent steel portion of said bar to come in contact withthe screw a at that side of the bar.

The steel plate of the thermostatic bar O renders said bar capable ofconducting an electric current, which is allowed to pass from 4the saidbar through the base A. The apparatus is in an electric circuit obtainedby wires m m, running from the battery (not necessary to be here shown)to binding-screws o o on the lower ends of the Vposts D D, and by aWire, n, running from the frame A either to the ground or back to thebattery, and with this electric circuit can belconnected an electricalarm-hell of any suitable and well-known style and construction; or itmay be used for various other purposes, exemplifications of which areshown in another application for Letters Patent of even date herewith,and the serial number of which is 198,075.

The operation of my improved thermostat is as follows: By turning theindicator I the thermostatic bar C is set in the requisite position toallow it to come in contact with one of the screws or contact-points awhen said bar is deflected by the degree of heat at which it is desiredto close the electric circuit. When the bar 0 is subjected to saiddegree of heat, it warps or deflects laterally at its free end and comesin contact with one of the screws a, and then the electric currentpasses from the Wire m through the post D, screw a, SteelI plate of thebar C, postB, frame A, andthc'nce through the Wire n either to theground or battery.

Having described my invention,what I claim as new, and desire to secureby Letters Pat, ent, isv 1. The combination of the base A, the post' B,pivoted on said base, the electric Conducting thermostatic ,bar firmlyattached to and extending from said post and adapted to de-' fiectlaterally under the influence of the changes of temperature, electriccontact'points at opp osite sides of the free end of the thermostaticbar, an arm rigidly attached to the post B, a clainp, c, for restrainingthe movement of said arm, and an electric circnit connected With thepost and contact-points, substantially as set forth.

2. rllhe combination of the base A, the post B, pivoted on said base,the electric conducting 3o thermostatc bar C, firmly attached to andextending` from said post and adapted to defiect laterally under theinfiuence of the changes of temperature, the posts D D, provided withelectric contact-points a a at opposite sides of 3 5 the'bar C, the armb, rgidly attached to the post B, the indicator I,- clamped adjustablyin its position and connected with the free end of the arm b, and anelectric crcuit connected with the posts B D D, substantially as setforth 4o and shown.

f In testimony whereof I have hereunto signed my name and affixed myseal, in the presence of two attesting. witnesses, at Elmira, in thecounty of Ohenlung, in the State of New York, 45 this 9th day of March,1886.

RICHARD L. GUION. L. s] Witnesses:

FERI) D. POTTER, THEo. G. SMITH.

